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From "Anu Engineer (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12990) Change default NameNode RPC port back to 8020
Date Fri, 02 Feb 2018 18:35:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12990?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16350776#comment-16350776

Anu Engineer commented on HDFS-12990:

I agree with [~atm] (based on comments in the mailing list) that we have discussed this issue
in depth, 
 both in this JIRA and in the mailing lists. As 3.0.1 is going to vote on Feb 9th, this is
the last window 
 for us to commit or discard this JIRA.

To break this impasse, I would like to propose that we commit this patch on Feb 6th, Noon,
 If anyone in the community feels that this should not be committed, +*Please provide your
 If we don't see an explicit -1, +I will commit this patch on Feb 6th, Tuesday, Noon, Pacific
Standard Time+. 
 I am hoping this will allow us to get to vote on 3.0.1.

I would like to propose further that we as a community tag 3.0.0 as *abandoned* so that we
 have to live with RPC port change in one version.

[~eyang], I know you have indicated that you are a -1 on this patch, but then later proposed
we discuss this. 
 *If you are still a -1 on this change, could you please make it explicit?*

[~atm], [~eddyxu], [~xiaochen] Please let me know if you see any issues with this late commit
 rolling the release; I prefer this Jira to be resolved before we get to vote.

> Change default NameNode RPC port back to 8020
> ---------------------------------------------
>                 Key: HDFS-12990
>                 URL: https://issues.apache.org/jira/browse/HDFS-12990
>             Project: Hadoop HDFS
>          Issue Type: Task
>          Components: namenode
>    Affects Versions: 3.0.0
>            Reporter: Xiao Chen
>            Assignee: Xiao Chen
>            Priority: Critical
>         Attachments: HDFS-12990.01.patch
> In HDFS-9427 (HDFS should not default to ephemeral ports), we changed all default ports
to ephemeral ports, which is very appreciated by admin. As part of that change, we also modified
the NN RPC port from the famous 8020 to 9820, to be closer to other ports changed there.
> With more integration going on, it appears that all the other ephemeral port changes
are fine, but the NN RPC port change is painful for downstream on migrating to Hadoop 3. Some
examples include:
> # Hive table locations pointing to hdfs://nn:port/dir
> # Downstream minicluster unit tests that assumed 8020
> # Oozie workflows / downstream scripts that used 8020
> This isn't a problem for HA URLs, since that does not include the port number. But considering
the downstream impact, instead of requiring all of them change their stuff, it would be a
way better experience to leave the NN port unchanged. This will benefit Hadoop 3 adoption
and ease unnecessary upgrade burdens.
> It is of course incompatible, but giving 3.0.0 is just out, IMO it worths to switch the
port back.

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